Question: The work index in Bond’s law for crushing of solids has the following dimensions__________________?

• 1. No units (dimensionless)
• 2. kWh/ton
• 3. kW/ton
• 4. kWh.m1/2/ton

Question: Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an________________?

• 1. Air filter
• 2. Bag filter
• 3. Venturi scrubber
• 4. Hydrocyclones

Question: All resistances during washing of cake _____________________?

• 1. Increases
• 2. Decreases
• 3. Remain constant
• 4. None of these

Question: Which of the following is the softest material ?

• 1. Talc
• 2. Feldspar
• 3. Corundum
• 4. Calcite

Question: Which of the following mechanical conveyors does not come under the division „scrapers‟ ?

• 1. Ribbon conveyor
• 2. Flight conveyor
• 3. Bucket elevators
• 4. Drag conveyor

Question: Close circuit grinding by a ball mill with air sweeping employs a _______________________?

• 1. Classifier
• 2. Cyclone separator between mill & classifier
• 3. Both A & B
• 4. Neither A nor B

Question: Trommels separate a mixture of particles depending on their_____________________?

• 1. Size
• 2. Density
• 3. Wettability
• 4. Electrical & magnetic properties

Question: The inlet pressure in a constant rate filtration____________________?

• 1. Increases continuously
• 2. Decreases gradually
• 3. Remains constant
• 4. None of these

Question: For spheres, volume shape factor is given by____________________?

• 1. π = (A/D2)
• 2. 2π = (2A/D2)
• 3. π/6 = (V/D3)
• 4. AD/V

Question: Which of the following screens has the maximum capacity ?

• 1. Grizzlies
• 2. Trommels
• 3. Shaking screen
• 4. Vibrating screen